Space & Stars

Planetary Transit Calculator

Calculate planetary transit properties.

Pulsar Period Calculator

Calculate pulsar properties.

Nebula Distance Calculator

Calculate nebula distance using expansion method.

Galactic Rotation Calculator

Calculate galactic rotation velocity.

Roche Limit Calculator

Calculate the Roche limit for satellite disruption.

Cosmic Microwave Background Calculator

Calculate CMB properties.

Aurora Visibility Calculator

Calculate aurora visibility probability.

Gravitational Lensing Calculator

Calculate light deflection angle by gravity.

Comet Orbit Calculator

Calculate comet orbit characteristics.

Star Spectral Class Calculator

Determine star spectral class from temperature.

CMB Temperature Calculator

Calculate CMB temperature at given redshift.

Age on Planets Calculator

Calculate your age in planetary years based on orbital periods.

Star Distance Calculator

Estimate star distance using parallax angle.

Telescope Magnification Calculator

Calculate telescope magnification power based on focal lengths.

Telescope Field of View Calculator

Free online calculator with instant, accurate results.

Redshift Calculator

Free online calculator with instant, accurate results.

Kepler's Third Law Calculator

Free online calculator with instant, accurate results.

Schwarzschild Radius Calculator

Free online calculator with instant, accurate results.

Planetary Surface Gravity Calculator

Free online calculator with instant, accurate results.

Solar Noon Calculator

Free online calculator with instant, accurate results.

Moon Phase Calendar

Free online tool — fast, accurate results in your browser.

Your Weight Across the Planets

Free online tool — fast, accurate results in your browser.